Was following some of the Unreal Documentation found here: Playing Live Video Captures | Unreal Engine Documentation
and I cannot seem to set a widget image brush image to a generated media texture as seen in this portion of the documentation:
Try it like this:
This method works. It feels though like my initial problem may be a bug then, would you recommend I report the documentation error?
Last time I tried to follow the doc, I couldn’t get it to work either 
There does not seem to be an option to set the image brush to media texture. The docs might be outdated, it never worked or we’re all missing something obvious.